The portable partial discharge detector is mainly used for the insulation status detection of medium and high voltage (usually 3kV and above) electrical equipment. The applicable equipment types, application fields and typical scenarios are as follows:
1. Applicable equipment types
Power cables and accessories
Cable body: XLPE cables, high-voltage cross-linked cables, etc. Detect air gaps, impurities or water tree discharges in the insulation layer.
Cable joints: Intermediate joints, terminal heads (indoor/outdoor), these parts are high-risk fault locations, and can detect discharges caused by poor installation process, stress cone misalignment, moisture, etc.
Application scenarios: Cable completion acceptance, preventive tests, verification after fault location, operation status inspection.
Switch cabinets and distribution equipment
High-voltage switch cabinets: Detect insulation defects of internal components (such as circuit breakers, disconnectors, busbars, current transformers, voltage transformers), local discharge inside the cabinet is the main cause of insulation breakdown and phase-to-phase short circuits.
Ring main units: As key equipment in the distribution network, regular detection of internal discharge is crucial.
Box-type substations: Comprehensive detection of transformers and switch equipment integrated in the box.
Power transformers
Dry-type transformers: Detect insulation defects of windings, interlayer and interlayer insulation, internal defects of epoxy resin casting, and lead wire discharges.
Oil-immersed transformers: Usually used as an external auxiliary detection method, combined with oil chromatography analysis, it can detect discharges in components such as bushings, oil reservoirs, and high-voltage leads.
Gas-insulated switchgear
GIS / GIL: Detect internal conductor burrs, floating potentials, surface dirt or cracks on insulators, metal particles, etc., which are important means for daily inspection and condition monitoring.
Rotating motors
High-voltage generators, large motors: Detect slot discharges, end discharges, insulation aging, etc. of stator windings.
Other high-voltage equipment
High-voltage bushings, insulators, lightning arresters, capacitors, transformers, etc.
2. Main application fields
Power system operation and maintenance
Regular inspection and status assessment of equipment in substations, switchgear stations, and distribution lines to achieve the transformation from “planned maintenance” to “condition-based maintenance”.
Status monitoring of high-voltage electrical equipment in factories and generators to ensure power supply safety.
Industrial fields
Metallurgy, chemical industry, mining, rail transit, data centers, etc. Industrial enterprises with their own substations and a large number of high-voltage motors and cables ensure continuous power supply and prevent production halts due to electrical faults.
Engineering construction and installation acceptance
Before commissioning new equipment or after major repairs, conduct partial discharge tests before operation to ensure qualified installation quality and avoid commissioning with hidden problems.
Used for factory tests, quality inspections to improve product reliability.
Third-party testing and technical services
Provide professional equipment condition assessment, fault diagnosis and consulting services for customers.
Research and education
Used for insulation material research, fault mechanism analysis, detection technology development, etc. in teaching and research activities.
3. Typical application scenarios
Preventive inspection: Conduct regular “physical examinations” of equipment, establish discharge signal baselines, and track their development trends.
Fault diagnosis and location: When equipment shows abnormalities (such as abnormal sounds, temperature rise, abnormal chromatographic data), quickly locate the discharge location and type, and guide maintenance.
Acceptance and pre-operation testing: Ensure good insulation status of newly installed or re-commissioned equipment.
Online monitoring assistance and verification: As a supplement and verification means to fixed online monitoring systems, conduct re-measurements and precise diagnosis.
Emergency repair support: Help determine the nature and impact range of faults after the occurrence of faults.
Post time: Jan-09-2026